.\" $OpenBSD: uhid.4,v 1.16 2010/07/10 20:40:34 gilles Exp $
.\" $NetBSD: uhid.4,v 1.13 2001/12/29 14:41:59 augustss Exp $
.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Lennart Augustsson.
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.Dd $Mdocdate: July 10 2010 $
.Dt UHID 4
.Os
.Sh NAME
.Nm uhid
.Nd USB generic HID support
.Sh SYNOPSIS
.Cd "uhid* at uhidev?"
.Sh DESCRIPTION
The
.Nm
driver provides support for all HID (Human Interface Device) interfaces
in USB devices that do not have a special driver.
.Pp
The device handles the following
.Xr ioctl 2
calls:
.Bl -tag -width indent
.It Dv USB_GET_REPORT_ID (int)
Get the report identifier used by this HID report.
.It Dv USB_GET_REPORT_DESC (struct usb_ctl_report_desc)
Get the HID report descriptor.
Using this descriptor the exact layout and meaning of data to/from
the device can be found.
The report descriptor is delivered without any processing.
.Bd -literal
struct usb_ctl_report_desc {
    int     ucrd_size;
    u_char  ucrd_data[1024];	/* filled data size will vary */
};
.Ed
.It Dv USB_SET_IMMED (int)
Sets the device in a mode where each
.Xr read 2
will return the current value of the input report.
Normally a
.Xr read 2
will only return the data that the device reports on its
interrupt pipe.
This call may fail if the device does not support this feature.
.It Dv USB_GET_REPORT (struct usb_ctl_report)
Get a report from the device without waiting for data on
the interrupt pipe.
The
.Fa report
field indicates which report is requested.
It should be
.Dv UHID_INPUT_REPORT ,
.Dv UHID_OUTPUT_REPORT ,
or
.Dv UHID_FEATURE_REPORT .
This call may fail if the device does not support this feature.
.Bd -literal
struct usb_ctl_report {
	int	ucr_report;
	u_char	ucr_data[1024];	/* used data size will vary */
};
.Ed
.It Dv USB_SET_REPORT (struct usb_ctl_report)
Set a report in the device.
The
.Dv report
field indicates which report is to be set.
It should be
.Dv UHID_INPUT_REPORT ,
.Dv UHID_OUTPUT_REPORT ,
or
.Dv UHID_FEATURE_REPORT .
This call may fail if the device does not support this feature.
.El
.Pp
Use
.Xr read 2
to get data from the device.
Data should be read in chunks of the size prescribed by the report descriptor.
.Pp
Use
.Xr write 2
send data to the device.
Data should be written in chunks of the size prescribed by the report
descriptor.
.Sh SEE ALSO
.Xr usbhidctl 1 ,
.Xr usbhid 3 ,
.Xr intro 4 ,
.Xr uhidev 4 ,
.Xr usb 4
.Sh HISTORY
The
.Nm
driver
appeared in
.Ox 2.6 .
